As style fiends rub their hands in glee over this week’s pre-Oscar fashion parade, Suzy Amis Cameron, wife of James Cameron, took the opportunity Thursday night to relay an important message about the importance of sustainable clothing on the red carpet.

Holding court at West Hollywood’s Palihouse, friends and family joined the passionate activist and her husband to celebrate the five-year anniversary of her Red Carpet Green Dress campaign, which promotes the importance of eco-friendly fashion through an annual design competition, with proceeds going toward her nonprofit school, MUSE School CA.

Mandela: Long Walk to FreedomactressNaomie Harris, who donned a slinky mustard-colored sustainable piece on last year’s Oscars carpet, was on hand for the festivities, eager to lend her support to Cameron’s movement.

“It’s been great, because I learned so much from having a dress made. I had no idea about how many toxic chemicals go into dying clothes, and how they seep into your skin,” said Harris, who donned a black Altuzarra dress with sheer cutouts and graphic Louboutin heels for the affair. “It’s really difficult to find out what goes into your clothing,” she lamented. “This industry is just starting out, and that’s why it needs as much support as possible, and that’s why I am so proud to be here tonight.”

The Legend of Hercules actor Kellan Lutz, who also attended the event, will be the first to wear a sustainable tux at this year's Oscars, designed by contest winner Jomnarn Dul.

Sporting a sustainably designed long black dress from L.A.’s Reformation, Amber Valletta, who recently debuted her own socially responsible lifestyle brand and website, Master and Muse, echoed Harris’ sentiments about eco-friendly clothing, and her admiration for fellow Oklahoman Cameron’s message.

“I’m definitely trying to incorporate a lot more of this into my wardrobe,” she said. But not even an environmentally conscious dress can convince Valletta to join in for the rest of the week’s revelry. “I canceled everything,” she laughed. “I’ve been traveling every single week for more than a month. I’m just not into it this year. I love the Oscars. I’m going to watch, maybe in my PJs, eating Chinese food, and maybe I’ll go for a massage.”